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Differentiation as symbiosis
1Department of Orthopedic Surgery, Gunma University School of Medicine, Japan.
Medical Hypotheses
|July 1, 1994
Summary
Multicellular organisms strive to preserve DNA identity. Genetic alterations in somatic cells, like tumors, act as parasites, potentially forming a symbiotic relationship with germline cells for DNA replication.
Area of Science:
- Evolutionary Biology
- Genetics
- Cell Biology
Background:
- Multicellular organisms prioritize DNA sequence preservation.
- Abnormal DNA sequences in somatic cells can exhibit parasitic behavior, as observed in tumors.
- Somatic gene alterations during development may represent the emergence of cellular parasites.
Purpose of the Study:
- To explore the concept of genetic alterations during development as a form of symbiosis.
- To investigate the role of somatic DNA alterations in cellular differentiation.
- To reconcile developmental genetic changes with the preservation of germline genetic information.
Main Methods:
- Conceptual analysis based on evolutionary and genetic theories.
- Application of the selfish gene theory to cellular interactions within an organism.
- Examination of DNA sequence preservation as a fundamental biological goal.
Main Results:
- Somatic gene arrangement and mutation can be viewed as the de novo formation of cellular parasites.
- Developmental processes involving genetic alterations may represent a symbiotic relationship between altered somatic cells and unaltered germline cells.
- Germline cells may permit this symbiosis if the somatic cell society profits from the replication of original DNA copies.
Conclusions:
- The preservation of DNA identity is a primary objective for multicellular life.
- Somatic genetic alterations can be conceptualized as parasitic elements within the organism's cellular society.
- A symbiotic relationship between altered somatic cells and the germline may facilitate the propagation of original genetic information.